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4 cards from this section. Quick, good the night before a test.
What is the relationship between electric current and magnetic fields?
Think about what happens when you pass current through a wire.
Define a solenoid in simple terms.
Consider its shape and what it does.
What is created around a current-carrying conductor?
Think about what a compass needle would do around a wire with current.
True or False: A solenoid only works with constant direct current.
Consider how voltages can be alternated.
A solenoid is wound with 100 turns and carries a current of 2A. What magnetic field strength does it produce at its center?
Use the constant values for μ₀ and rearrange the equation according to the number of loops and current.
An electric motor uses a coil with a magnetic field of 0.5T. If the current is increased to 3A, what would be the new strength of the magnetic field assuming a linear relationship?
Consider how an increase in current affects the magnetic field strength.
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